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Why is division in Ruby returning an integer instead of decimal value?
...t are floats to begin with. I've built a prime number generator in Ruby in order to learn the syntax, now I'm optimizing it to learn what works best. Here's the benchmark I put together: require 'base64';require 'zlib';puts Zlib.inflate(Base64.decode64("eJxlkMEOwiAQRO98hekFuGzxQEwPXvwR01ZqiYHqBk2Tln...
How random is JavaScript's Math.random?
...andom gives you an uniform distribution of numbers.
If you want different orders of magnitude, I would suggest using an exponential function to create what's called a power law distribution:
function random_powerlaw(mini, maxi) {
return Math.ceil(Math.exp(Math.random()*(Math.log(maxi)-Math.log...
Take a full page screenshot with Firefox on the command-line
...er Toolbar to open a command line. Write:
screenshot
and press Enter in order to take a screenshot.
To fully answer the question, you can even save the whole page, not only the visible part of it:
screenshot --fullpage
And to copy the screenshot to clipboard, use --clipboard option:
screensh...
How to rename a single column in a data.frame?
..., in general (more than once column)
nms <- c("col1.name", "col2.name", etc...)
setnames(DF, nms)
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How to get a resource id with a known resource name?
...eful in the context of writing tests to make sure certain strings exist or etc.
– Ehtesh Choudhury
May 1 '15 at 22:14
1
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WPF and initial focus
...ion.First));
This will automatically select the first control in the tab order, so it's a general solution that should be able to be dropped into any window and Just Work.
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Executing Batch File in C#
... You could try to dump out the contents of the output and error streams in order to find out what's happening:
static void ExecuteCommand(string command)
{
int exitCode;
ProcessStartInfo processInfo;
Process process;
processInfo = new ProcessStartInfo("cmd.exe", "/c " + command);
...
How can you use optional parameters in C#?
...rameters by their names, and of course you can pass parameters in whatever order you want :)
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Checking for empty queryset in Django
...ist before the check is made. In my case execution time went down by three orders.
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Naming threads and thread-pools of ExecutorService
...y, you can alter the thread's name, thread group, priority, daemon status, etc. If a ThreadFactory fails to create a thread when asked by returning null from newThread, the executor will continue, but might not be able to execute any tasks
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